add changelog entry

Author: Trivo25

kimchi/CHANGELOG.md

@@ -3,14 +3,14 @@
 All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
-and this project adheres to
-[Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
 - Serialization in JSON now uses hexstrings for bytearrays.
 - Upgrade to Rust 1.67.0
 - Remove unneeded ChaCha gates
+- Enforce deterministic ordering of gate lookup tables by replacing `HashSet` with `BTreeSet`
 
 ## 0.1.0 (2023-02-06)